CMT 531.701 Rosette Cutter, 2-3/4-Inch Diameter x 3-1/64-Inch Length, 3/8-Inch Shank Made of super strength high-speed steel (HS). 2 precision ground carbide cutting edges. Parallel hexagonal shank. For boring rosette shapes. Use on standing drilling machine and drilling power tools at low RPM (Max 1800 RPM).